Coke oven



Patented Feb. 13, 1923.

uNTTau sTaTas OLIVIER PIETTE, 0F BRUSSELS, BELGIUM.

COKE OVEN'.

Application led April 7, 1921.

To all whomz't may concern. Y

Beit known that I, OLIVIER PIETTE, a subject of the' King of Belgium, and resident of Brussels, in the Kingdom of Belgium, have invented certain new and useful Improvements in and Relating to Coke Ovens; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked therein which form a part of this specification.

In a coke oven of the type described in the U. S. Patent 1,370,481 delivered on the first of March 1921, the combustion of the gas is produced at the base of the vertical flues of the lateral walls divided relatively to ytheir transverse axes into two parts delimiting portions of equal capacity in the carbonization chambers.

The gases in combustion in the flues of one half of the lateral wall, rise in each vertical flue, unite together in the horizontal channel passing above the said ues and descend through the flues of the other half of the lateral wall in order to penetrate afterwards in the regenerators through the intermediary of a flue of the hearth which. extends over half the oven.

The reversing of the current of iiuids is periodically effected.

In order to effect an economical heating in the said ovens, it is advantageous'to send to the chimney products of combustion containing a small percentage of free oxygen only.

It is, however, necessary for various reasons to send into the vertical flues of the oven, a; quantity of air much larger than the theoretical quantity. Indeed the gases from the coke oven which are burned in the fiues with a quantity of hot air giving a theoretical combustion would produce a temperature of combustion -which would cause the melting of the bricks of the lateral walls.

Moreover, it is advantageous to limit thelength of the flames which rise in the -flues in order to avoid too high a temperature of the upper part of the charge and to prevent thus the decomposition of certain by-products.

It is not practical to carry out the theoretical combustion in the flues with rising flames, it is rational to make ua judicious' SeriaI No. 459,439.

choice of means allowing of avoiding the drawbacks above-mentioned by an appreclable excess of hot air, a primary rapid combustion of the gases admitted to the baise of the upward flues, and to make use ofthe said excess of air for causing, together with the supplementary quantity of gas admitted 1n a suitable region, a secondary combustion giving products of combustion approximately corresponding to the theoretical combustion.

The object ofthe present invention is to obtain in ovens of the kind above-mentioned the combination in each lateral wall, on the one hand of a primary admission of gas at the base of the vertical flues situated on one side of the axis of the battery and receiving a certain excess of hot air, and on the other hand, an arrangement of one or several secondary `gas admissions in that part 0f the' horizontal collector of the lateral wall which is situated on the other side of the axis of the battery, for the purpose of effecting in the said part of the collecting channel, a mixture of the said additional quantity of gas with theproducts of combustion having a small combustible power, and to obtain a` second slow combustion which will be achieved in the gases descending in the heating fines on this' side of the furnace in order-to give products of combustion free from any harmful excess of air.

The above system is essentially different from the various other systems of similar ovens in which gas admissions have been provided at the upper part and the lower part of the vertical flues.

The accompanying drawings illustrate diagrammatically and by way of example la mode 0f construction of an oven according to the present invention.

Figs. 1 and 2 are two identical transverse sections during two different periods of working.

In the following description reference numerals with a dash are used for the, elements of construction similar to those represented by the numerals without dashes but situated on the opposite side of the axis of the battery.

Fig. 1 shows a working period in which the total admission of the air necessary -for the combustion 5 and the primary admission of gas 1 are effected at the base of each of the flues arranged on the left side of the axis of the battery, and the productJ of the combustion-unite together in the horizontal collecting flue 3 in order to pass on the other side of the axis of the battery into the flue 3. One or several secondary gas admissions 4 are arranged in the said flue 3', and are adjusted in such a manner as to give a quantity of gas which is proportional to the quantity of oxygen which is found the products of combustion passing on this side ,ofthe axis of the battery.

In the flue '3, the said supplementary quantity of' gas is progressively mixed with the products of combustion at anhigh temperature but of a. small combustible power and cause the beginning of a secondary combustion which will be achieved in the fines 2 and will give productsl of combustion which will be almost free from oxygen which products leave through openings 5 into the flues of the right hearth and afterwards' into the regenerators placed on this side.

Fig. 2 shows a period of working after the draught has been reversed. The total admission of air is effected through the openings 5, and the primary admlssion of gas is effected through openings 1 sigiated at the base of the fiues 2, arranged on the right side of the axis of the battery. The products of the combustion unite in the ,horizontal collecting flue 3', and pass to the other side of the axis of the battery into the iue 3. By means of one or lseveral sebndary gas admissions 4 arranged inthe said flue,

a quantity of gas is admitted which is proportional to the quantity of oxygen which is found in the products of combustion passing on thisV side of the axis of the battery. The said products of combustionare progressively mixed in theviue 3 with a supplementary quantity of gas which is admitted and a second combustion is started which will be achieved in the flues 2 in order to give products of combustion almost free from oxygen and leaving through openings 5 into the flue on the Ileft hand side of the hearth, passing afterwards into the regenerators piaced on the other side.

WhatI claim is:

A regenerative horizontal coke oven having vertical heating flues .and a horizontal collector above said vertical fines and with which thelatter communicateat their upper ends, said oven comprising means at the base ofthe vertical iues on each side of the axis of said oven for the admission of gas and a quantity of heated air in excess of that required for the combustion of said gas and means for admission of additional gas into the part of said horizontal collector on each side of said axis7 whereby, when gas and air are admitted to the iues on one side of said-axis, additional gas may be admitted to the part of said horizontalA collector above the vertical iues on the other.

side of said axis, and vice versa.

testlmony whereof I afhx my slgnature in presence of two Wltnesses. v

OLIVIER PIETTE.

f Witnesses:

LEONARD LERA, JEAN DEsonR. 

